US5680439A - Fixed cellular technical with a distinctive dial tone to indicate an emergency call is being placed - Google Patents

Fixed cellular technical with a distinctive dial tone to indicate an emergency call is being placed Download PDF

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Publication number
US5680439A
US5680439A US08/430,810 US43081095A US5680439A US 5680439 A US5680439 A US 5680439A US 43081095 A US43081095 A US 43081095A US 5680439 A US5680439 A US 5680439A
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United States
Prior art keywords
terminal
tone
fixed cellular
subscriber
dial tone
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US08/430,810
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English (en)
Inventor
Jose Maria Garcia Aguilera
Francisco Javier Leon Rubio
Ramiro Ramirez Ramirez
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Alcatel Lucent NV
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Alcatel NV
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Assigned to ALCATEL N.V. reassignment ALCATEL N.V. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GARCIA AGUILERA, JOSE M., LEON RUBIO, FRANCISCO J., RAMIREZ RAMIREZ, RAMIRO
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Publication of US5680439A publication Critical patent/US5680439A/en
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Expired - Fee Related legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/021—Terminal devices adapted for Wireless Local Loop operation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/66—Substation equipment, e.g. for use by subscribers with means for preventing unauthorised or fraudulent calling
    • H04M1/677—Preventing the dialling or sending of predetermined telephone numbers or selected types of telephone numbers, e.g. long distance numbers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/90—Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/50—Connection management for emergency connections

Definitions

  • This invention concerns a fixed cellular terminal for use in cellular mobile communications networks that offer services of voice and/or data to a number of terminals either of the telephone type or of any other type, being particularly useful in those environments where there is still no fixed communications infrastructure, or where the fixed communications infrastructure has become saturated and it is planned to form an operational "island" to which this communications service can be offered.
  • the equipment described herein is of particular application in fixed communications services based on systems of cellular mobile coverage of the GSM type.
  • the GSM cellular network is one of the candidates for supporting this type of service.
  • This type of fixed cellular terminal although having to be transparent with respect to the channel used (from the point of view of the user the telephone has to behave as if it were a terminal of the standard basic telephone service), presents certain functional differences that have to be allowed for.
  • dial tone which, in the case of a fixed standard infrastructure, has to be sent by the exchange, so that its reception implies line availability. Nonetheless, when infrastructure is based on cellular networks, this dial tone is generated locally by the interface depending on the cellular system operational state. In cases of lines being engaged or saturated, a standard GSM terminal, once the call attempt has been made and depending on the result, generates a line busy or saturation tone that, respectively, indicates unavailability to set up the desired call.
  • This service is obligatory for terminals using the GSM mobile telephony standard and, by extension, a fixed cellular GSM terminal must also support this service.
  • the GSM terminals require the introduction of a so-called SIM board (Subscriber Identity Module) for full operation. If this board is not operational, the GSM terminal is unable to set up normal calls, since it is in the SIM that essential data are stored (mobile subscriber number, ciphering key, etc.) for the operation of the terminal.
  • SIM board Subscriber Identity Module
  • the technical problem therefore lies in resolving the ambiguous situation mentioned above in which the terminal is out of service or in a restricted service state.
  • the terminal according to the invention is of particular application in cellular mobile networks for communicating, via radio, with at least one base station and in this way providing a voice and/or data communications service for one or more subscribers.
  • cellular mobile networks in addition to the basic communications service, also facilitate an emergency call service through the terminal.
  • the terminal comprises means to generate user signalling tones that are transmitted to the telephone set connected to it so that it indicates line availability for dialling a number indicates a state of line occupancy or congestion, making it impossible to seize an outgoing channel in order to make the call.
  • the fixed cellular terminal explained here is characterised in that it also generates a dial tone for emergency calls, different from the other tones already existing. This tone is generated by respective means of the corresponding line interface circuit.
  • this invention is also characterised in that the emergency call dial tone is produced when the fixed cellular terminal only has the facilities for establishing emergency calls.
  • the subscriber to the basic telephone service through the provision of a fixed cellular terminal, included in the coverage zone of a base station of a cellular mobile network, can determine if the fixed cellular terminal is only equipped for making emergency calls, in contrast to the other situations that can arise in a telephone whose service is provided directly by means of the fixed network.
  • This type of terminal avoids situations of unreal unavailability of service and that, even with the fixed cellular terminal being in a restricted service condition for some reason, complete incommunication does not arise.
  • FIG. 1 illustrates the formation of a communications network based on a cellular system with fixed cellular terminals and fixed local infrastructure
  • FIG. 2 shows part of the tone generating module and line matching module to which the telephone set is connected.
  • a mobile cellular communications network CS formed by a mobile switching centre 2 which is connected to a communications network of greater coverage, for example, the public switched network 1.
  • a mobile switching centre 2 are connected to a number of base stations 3 belonging to the mobile cellular communications network CS and which are distributed over a determined zone in order to provide it with cellular coverage.
  • a fixed cellular terminal 4 So as to use this cellular infrastructure to give service to subscribers to the basic telephone service who are widely distributed geographically, what is known as a fixed cellular terminal 4 was developed, which was derived from a mobile cellular terminal with reduced functionality.
  • the features not applicable to the fixed cellular terminal are, for example, those relating to the characteristics of mobility, the requirement for which greatly increases the complexity of the cellular network design.
  • the fixed cellular terminal 4 has to have an interface that performs all the necessary matching so that the two wires of the line interface to which each subscriber is connected, satisfy the same physical and operational characteristics as those offered by an interface pertaining to a local exchange of the basic telephone service. All of the foregoing is well known from the state of the art.
  • SIM Subscriber Identity Module
  • FIG. 2 shows the final stage 8 of the line interface included in the fixed cellular terminal 4 that connects this terminal to a telephone terminal 5 by means of the subscriber line L.
  • This terminal incorporates a control circuit 42 that receives information from other parts of it in order to indicate to the tone generating means 41 the type of user signalling tone that has to be generated when there is an outgoing call attempt coming from a subscriber station 5 and directed to the network. For example, dial tone in the event that the subscriber 5 unhooks the terminal and it is possible to make calls over the network, or busy tone in the case that there is no available line, etc.
  • there is an additional tone which is the emergency call dial tone. This is indicated to the tone generating means 41 via a control circuit 42 when the SIM card is not operational. This permits the subscriber to identify this situation and act in consequence (call to repair service centre, updating of SIM, etc.), and also to have available the emergency call service if required.
  • the control circuit 42 also has another selection output SELEC that is applied to multiplexing means 43 that produce a signal A at its output that can be the tone signal T generated by the tone generating means 41 or the audio reception signal S coming from the baseband part of the fixed cellular terminal 4.
  • SELEC selection output
  • the output signal A from the multiplexing means 43 is applied to one of the inputs of a hybrid coil 44 which directs this signal A towards the subscriber line L to which the telephone terminal 5 is connected.
  • the signal coming from the telephone terminal 5 destined for the fixed cellular terminal 4 over the subscriber line L arrives at the hybrid coil 44 and is directed, via another output of the latter, as the audio transmission signal M, to the baseband part of the fixed cellular terminal 4.
  • a matching load 45 that permits balancing of the load of the subscriber line L so that the output signal A of the multiplexing means 43 is applied entirely to the subscriber line L and is not coupled into the baseband as an audio transmission signal M and that the signal coming from the telephone terminal is sent to the baseband part as the audio transmission signal M and there is no shunting into the multiplexing means 43 nor return echo to the telephone terminal 5.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Telephone Set Structure (AREA)
  • Telephonic Communication Services (AREA)
US08/430,810 1994-04-29 1995-04-28 Fixed cellular technical with a distinctive dial tone to indicate an emergency call is being placed Expired - Fee Related US5680439A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES9400917 1994-04-29
ES09400917A ES2101629B1 (es) 1994-04-29 1994-04-29 Terminal celular fijo.

Publications (1)

Publication Number Publication Date
US5680439A true US5680439A (en) 1997-10-21

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US08/430,810 Expired - Fee Related US5680439A (en) 1994-04-29 1995-04-28 Fixed cellular technical with a distinctive dial tone to indicate an emergency call is being placed

Country Status (13)

Country Link
US (1) US5680439A (pl)
EP (1) EP0680230B1 (pl)
JP (1) JPH0851667A (pl)
CN (1) CN1072885C (pl)
AT (1) ATE186810T1 (pl)
AU (1) AU695683B2 (pl)
CA (1) CA2148185A1 (pl)
DE (1) DE69513322T2 (pl)
ES (1) ES2101629B1 (pl)
NZ (1) NZ270947A (pl)
PL (1) PL177285B1 (pl)
RU (1) RU95106469A (pl)
ZA (1) ZA953411B (pl)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5960363A (en) * 1996-01-24 1999-09-28 Sony Corporation Tone generating apparatus for a cellular telephone to simulate tones normally sensed by a user of a land-line telephone
US6122508A (en) * 1995-12-16 2000-09-19 Alcatel Mobile radio system with wireline subscriber lines
US6185412B1 (en) * 1996-11-26 2001-02-06 Nokia Telecommunications Oy Procedure and system for ensuring emergency communication in a wireless local loop environment
US6631179B1 (en) 1998-06-10 2003-10-07 Henry Sifuentes Voice and motion activated telephone
US6661880B1 (en) * 2001-06-12 2003-12-09 3Com Corporation System and method for embedding digital information in a dial tone signal
US7286522B2 (en) 1998-05-19 2007-10-23 Airbiquity, Inc. Synchronizer for use with improved in-band signaling for data communications over digital wireless telecommunications networks
US7317696B2 (en) 1997-05-19 2008-01-08 Airbiquity Inc. Method for in-band signaling of data over digital wireless telecommunications networks
US7733853B2 (en) 2005-01-31 2010-06-08 Airbiquity, Inc. Voice channel control of wireless packet data communications
US7792053B1 (en) * 2002-07-08 2010-09-07 At&T Intellectual Property Ii, L.P. System for accessing end-to-end broadband network via network access server platform
US20100273422A1 (en) * 2009-04-27 2010-10-28 Airbiquity Inc. Using a bluetooth capable mobile phone to access a remote network
US7924934B2 (en) 2006-04-07 2011-04-12 Airbiquity, Inc. Time diversity voice channel data communications
US7979095B2 (en) 2007-10-20 2011-07-12 Airbiquity, Inc. Wireless in-band signaling with in-vehicle systems
US7983310B2 (en) 2008-09-15 2011-07-19 Airbiquity Inc. Methods for in-band signaling through enhanced variable-rate codecs
US8249865B2 (en) 2009-11-23 2012-08-21 Airbiquity Inc. Adaptive data transmission for a digital in-band modem operating over a voice channel
US8418039B2 (en) 2009-08-03 2013-04-09 Airbiquity Inc. Efficient error correction scheme for data transmission in a wireless in-band signaling system
US8594138B2 (en) 2008-09-15 2013-11-26 Airbiquity Inc. Methods for in-band signaling through enhanced variable-rate codecs
US8848825B2 (en) 2011-09-22 2014-09-30 Airbiquity Inc. Echo cancellation in wireless inband signaling modem

Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
US6104909A (en) * 1997-07-30 2000-08-15 Motorola, Inc. Method and apparatus for reporting status information in a fixed wireless terminal
US7787855B2 (en) * 2003-03-31 2010-08-31 Motorola, Inc. Establishing emergency sessions in packet data networks for wireless devices having invalid subscriber identities
KR101122359B1 (ko) * 2004-05-07 2012-03-23 인터디지탈 테크날러지 코포레이션 무선 근거리 통신망의 긴급 호 지원

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US5016269A (en) * 1988-11-04 1991-05-14 Gte Mobilnet, Incorporated Method and apparatus for utilizing a cellular telephone in a programmable, intelligent emergency freeway callbox
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EP0059314A1 (en) * 1981-02-26 1982-09-08 Display-Design GmbH für moderne Verkaufsförderungsmittel und Raumausstattung Modular merchandise display tower
US4658096A (en) * 1984-09-18 1987-04-14 Metrofone, Inc. System for interfacing a standard telephone set with a radio transceiver
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US5016269A (en) * 1988-11-04 1991-05-14 Gte Mobilnet, Incorporated Method and apparatus for utilizing a cellular telephone in a programmable, intelligent emergency freeway callbox
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US5203009A (en) * 1991-12-19 1993-04-13 Motorola, Inc. Radio transceiver having fixed calling capacity

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Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6122508A (en) * 1995-12-16 2000-09-19 Alcatel Mobile radio system with wireline subscriber lines
US5960363A (en) * 1996-01-24 1999-09-28 Sony Corporation Tone generating apparatus for a cellular telephone to simulate tones normally sensed by a user of a land-line telephone
US6185412B1 (en) * 1996-11-26 2001-02-06 Nokia Telecommunications Oy Procedure and system for ensuring emergency communication in a wireless local loop environment
US7747281B2 (en) 1997-05-19 2010-06-29 Airbiquity Inc. Method for in-band signaling of data over digital wireless telecommunications networks
US7317696B2 (en) 1997-05-19 2008-01-08 Airbiquity Inc. Method for in-band signaling of data over digital wireless telecommunications networks
US8068792B2 (en) 1998-05-19 2011-11-29 Airbiquity Inc. In-band signaling for data communications over digital wireless telecommunications networks
US7286522B2 (en) 1998-05-19 2007-10-23 Airbiquity, Inc. Synchronizer for use with improved in-band signaling for data communications over digital wireless telecommunications networks
US6631179B1 (en) 1998-06-10 2003-10-07 Henry Sifuentes Voice and motion activated telephone
US6661880B1 (en) * 2001-06-12 2003-12-09 3Com Corporation System and method for embedding digital information in a dial tone signal
US8837324B2 (en) 2002-06-07 2014-09-16 At&T Intellectual Property Ii, L.P. Methods for accessing end-to-end broadband network via network access server platform
US20110013620A1 (en) * 2002-06-07 2011-01-20 Chow Albert T System for Accessing End-to-End Broadband Network Via Network Access Server Platform
US7792053B1 (en) * 2002-07-08 2010-09-07 At&T Intellectual Property Ii, L.P. System for accessing end-to-end broadband network via network access server platform
US7796538B1 (en) 2002-07-08 2010-09-14 At&T Intellectual Property Ii, L.P. System for accessing end-to-end broadband network via network access server platform
US7733853B2 (en) 2005-01-31 2010-06-08 Airbiquity, Inc. Voice channel control of wireless packet data communications
US8036201B2 (en) 2005-01-31 2011-10-11 Airbiquity, Inc. Voice channel control of wireless packet data communications
US7924934B2 (en) 2006-04-07 2011-04-12 Airbiquity, Inc. Time diversity voice channel data communications
US7979095B2 (en) 2007-10-20 2011-07-12 Airbiquity, Inc. Wireless in-band signaling with in-vehicle systems
US8369393B2 (en) 2007-10-20 2013-02-05 Airbiquity Inc. Wireless in-band signaling with in-vehicle systems
US7983310B2 (en) 2008-09-15 2011-07-19 Airbiquity Inc. Methods for in-band signaling through enhanced variable-rate codecs
US8594138B2 (en) 2008-09-15 2013-11-26 Airbiquity Inc. Methods for in-band signaling through enhanced variable-rate codecs
US8036600B2 (en) 2009-04-27 2011-10-11 Airbiquity, Inc. Using a bluetooth capable mobile phone to access a remote network
US8073440B2 (en) 2009-04-27 2011-12-06 Airbiquity, Inc. Automatic gain control in a personal navigation device
US8195093B2 (en) 2009-04-27 2012-06-05 Darrin Garrett Using a bluetooth capable mobile phone to access a remote network
US8346227B2 (en) 2009-04-27 2013-01-01 Airbiquity Inc. Automatic gain control in a navigation device
US8452247B2 (en) 2009-04-27 2013-05-28 Airbiquity Inc. Automatic gain control
US20100273422A1 (en) * 2009-04-27 2010-10-28 Airbiquity Inc. Using a bluetooth capable mobile phone to access a remote network
US8418039B2 (en) 2009-08-03 2013-04-09 Airbiquity Inc. Efficient error correction scheme for data transmission in a wireless in-band signaling system
US8249865B2 (en) 2009-11-23 2012-08-21 Airbiquity Inc. Adaptive data transmission for a digital in-band modem operating over a voice channel
US8848825B2 (en) 2011-09-22 2014-09-30 Airbiquity Inc. Echo cancellation in wireless inband signaling modem

Also Published As

Publication number Publication date
JPH0851667A (ja) 1996-02-20
CA2148185A1 (en) 1995-10-30
ATE186810T1 (de) 1999-12-15
ZA953411B (en) 1996-01-11
DE69513322T2 (de) 2000-07-27
AU695683B2 (en) 1998-08-20
NZ270947A (en) 1997-01-29
ES2101629B1 (es) 1998-03-01
PL177285B1 (pl) 1999-10-29
CN1072885C (zh) 2001-10-10
EP0680230A1 (en) 1995-11-02
AU1763795A (en) 1995-11-09
DE69513322D1 (de) 1999-12-23
ES2101629A1 (es) 1997-07-01
RU95106469A (ru) 1997-01-20
PL308333A1 (en) 1995-10-30
CN1111892A (zh) 1995-11-15
EP0680230B1 (en) 1999-11-17

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